Greenhouses help gardeners grow plants they would not normally be able to grow in their gardens and plants they could not grow outside during the colder times of the year. This is certainly true in northern countries where there are often frosts at night.
The glass in a greenhouse is the secret of its success. This takes in light and warmth from the sun, providing energy for plants to grow. The glass keeps out cold winds too. And if a greenhouse is heated, it is possible to grow warmth-loving plants like grapes in countries where they would not usually survive.
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